How can flame color identify an unknown metal? How can a spectrum positively identify an element?
How can astronomers tell which elements a star contains without a sample of it?

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .

your answer is c) plasma

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